Visual determination of nitrite and nitrate in waters by color band formation method.

Chapter 4 – Tests for the Elements, their Ions and Compounds

Error sources associated with the spectrophotometric determination of low levels (e.g. 90%) of nitrate from the marine lake sediments studied was achieved with 15 min mixing with 0.1 M NH4CI, using a sediment to extractant ratio of 1:30. The nitrate in the extracts was determined by reducing it to nitrite (using Cd powder), with subsequent colour development based on the addition of sulfanilic acid and N-1-naphthyl-ethylenediamine dihydrochloride. The reduction step was sensitive to the experimental conditions used, but was near quantitative using 0.1 M NH4CI extracts. (Much lower transformation levels were observed when the nitrate solutions contained KCI or CaSO4, or when Zn powder was u...

Errors in the determination of low levels of nitrate in lake sediments

Estimation of micro quantities of nitrate in water with a single tablet-formed reagent

The objective of this study was to examine the effects of addition of inoculant to high-nitrogen (N) fertilized timothy on fermentation, nutritive value, and feed intake of silage. The silage of timothy cultivated with a N fertilizer rate at two levels (high level (H), standard level (S)) was prepared with (SI, HI) or without (SC, HC) an inoculants. The CP content of H increased by 38 g&middotkg-1 DM compared with that of S, and the WSC and ADF contents decreased compared with those of S. Regarding the fermentation of silage, the pH and NH3-N ratio was significantly lower in the silage with inoculant (SI and HI), showing improvement of the fermentation compared with those of the silage without the addition (SC and HC). The CP content was significantly higher in HC and HI than in SC and SI, and the NDF content was the lowest in HI among the four treatments. The CP digestibility of HC and HI was significantly higher than those of SC and SI. The EE digestibility of SI was significantly higher than that of SC, and that of HI was significantly higher than that of HC. The DCP contents were significantly higher in HC and HI than in SC and SI. The TDN content was the lowest in SC and highest in HI. The DCP intakes of HC and HI were significantly higher than those of SC and SI. When the N fertilizer rate was increased, the DCP content and DCP intake of the silage increased, and the addition of inoculant improved the fermentation and increased the TDN content.

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Effects of Addition of Lactobacillus plantarum and Enterococcus faecium Inoculants to High-Nitrogen Fertilized Timothy (Phleum pratense L.) on Fermentation, Nutritive Value, and Feed Intake of Silage

Akira Hirakoba

Papers

Spectrophotometric determination of nitrate ion in the presence of nitrite ion